Creating an Offset

How Do I......

Create an Offset

Quick Help-

Orbitas Field allows you to collect an offset location using several supported methods. The first and more accurate method is utilizing an external laser range finder. The second is to utilize the camera on the iOS device. While the second method is not at as accurate as the first , it is a convenient and fast way to collect an offset location. Read below for further details.

Detailed Help-

Using an external range finder:
  • Start by opening a job and collecting a LOCATION like normal.
    You can use Tap to Place, Integrated Services, or a connected Asteri GNSS.
    However, please note, the calculated position will be affected by the accuracy of the starting point for offset.
    See the section further down on “Understanding the math behind an offset”
  • Before Clicking Save… Select the OFFSET ICON shown below:
  • Shoot your target with your laser range finder.
  • Type in the offset values from your range finder in the appropriate fields.
  • Click SAVE to commit changes in Laser Offset Form
  • Click SAVE on the Location Form just as you would for any other Location.

In the example below we utilized the a TruePulse LTI 360. The more accurate the offset device, the better the results. Please keep in mind: You need to supply a “True North” offset with valid compass calibration (see manufacturer instructions). Also, a projected XYZ must be used for accurate triangulation. In order to do this in Orbitas , you need a good internet connection.
Offset is displayed at the corner of the building we were shooting to, this is a successful offset.

*Note on Bearing:
Each laser manufacturer is different, so you must consult your manufacturer about the “type” of bearing being sent. We expect True North as mentioned above. The LTI 360 has the ability to enter in the “Declination” for your region. We have found this site to be great for finding values for your work area:
https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml

Using the Integrated iOS camera:
  • Begin by collecting your Location as before, and then selecting the offset tool as in the first example.
  • Select the “*” Icon to the right of the BEARING field.
  • The target is now displayed in a camera form. There is a small “ BOX ” we will call the “TARGET” in the center of the form. It is critical that the bottom of the target you are shooting at, is at the same “LEVEL” as the height the antenna collecting the position is placed. (with a 2meter antenna height on rover, shoot a target 2meters up on structure.)
  • Next, ensure that the HEIGHT on the slider bar, is the exact height as the camera lens on the iOS device. We recommend physically mounting the iOS device to a range pole or tripod on a pivoting mount. *In this example, the device was handheld, and you will see minor triangulation issues due to this.
  • Click SAVE after placing the target on the structure.
Parts on the Camera form:
  1. Target Box: Ensure to place the target but at the Antenna height, not ground level.
  2. Camera Lens Height: Use this slider to adjust your camera height.
  3. Save Icon: Click the save icon after setting target and adjusting the camera height.
TGT triangle logo